chemical engineering process control and instrumentation MCQs – Page 4

Practise multiple-choice questions from chemical engineering process control and instrumentation for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering process control and instrumentation Mcqs
61. The unit step response of the transfer function (2s 1)/[(3s + 1) (4s + 1)] reaches its final steady state asymptotically after _____________?
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A. A monotonic decrease

B. A monotonic increase

C. Initially increasing and then decreasing

D. Increasing decreasing and then increasing

62. Bourdon tube is never made of________________?
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A. Monel metal

B. Cast iron

C. Stainless steel

D. Phosphor bronze

63. Conversion formula for converting amplitude ratio (AR) into decibels is ________________?
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A. Decibel = 20 log10 (AR)0.5

B. Decibel = 20 log10 (AR)

C. Decibel = 20 loge (AR)

D. Decibel = 20 loge (AR)0.5

64. Routh test_________________?
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A. Criterion is not applicable to systems with polynomial characteristic equation

B. Criterion provides information about the actual location of roots

C. Cannot be used to test the stability of a control system containing transportation lag

D. Cannot determine as to how many roots of the characteristics equation have positive real roots

65. Which of the following is not a variable area flow meter ?
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A. Orifice and tapered plug meter

B. Piston type meter

C. Magnetic flow meter

D. Rotameter

66. Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively_________________?
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A. 273 & 80

B. 32 & 460

C. 0 & 80

D. 32 & 80

67. The closed loop pole of a stable second order system could be_______________?
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A. Both real and positive

B. Complex conjugate with positive real parts

C. Both real and negative

D. One real positive and the other real negative

68. The response of two tanks of same size and resistance in series is __________________?
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A. Over damped

B. Under damped

C. Critically damped

D. None of the above

69. Pirani gauge is used for the measurement of________________?
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A. Very high pressure

B. Liquid level at atmospheric pressure

C. Liquid level under pressure

D. High vacuum
70. Maximum differential pressure in liquid manometer is ______________ psi?
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A. 20

B. 50

C. 40

D. 30
71. A stable system is the one___________________?
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A. Which satisfies the conditions for a servo problem

B. For which the output response is bounded for all bounded input

C. None of these

D. Which exhibits an unbounded response to a bounded input

72. High temperature of around 2000C of incandescent gas mantles is measured by a/an __________________?
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A. Specially designed thermocouple

B. Optical pyrometer

C. Radiation pyrometer

D. None of these

73. What is the dynamic error in a critically damped second order instrument for a ramp input (At) ?
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A. ?(AT)

B. 2 AT

C. 0.5 AT

D. 1.5 AT

74. Which of the following thermocouples has the widest temperature measurement range ?
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A. Chromel-alumel

B. Copper-constantan

C. Iron-constantan

D. Platinum-platinum/rhodium
75. In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the ______________ variable?
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A. None of these

B. Manipulated

C. Load

D. Controlled

76. Polarograph is meant for the analysis of __________________?
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A. Miscible liquids

B. Isotopes

C. Gaseous mixture

D. Solids
77. The ______________ of a vapor pressure thermometer is a primary element?
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A. Bourdon tube

B. Pointer

C. Bulb

D. None of these

78. Presence of a small amount of water in the organic systems can be determined by the _____________ method?
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A. Polarimetry

B. Dielectric constant end loss factor

C. Electrical conductivity

D. Emission spectroscopy

79. Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their ?
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A. Low thermal conductivity

B. High viscosity index

C. Low flash point

D. Low electrical conductivity
80. In second order underdamped system ?
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A. Decay ratio = overshoot

B. Decay ratio = (overshoot)2

C. Large damping co-efficient means smaller damping

D. Overshoot increases for increasing damping co-efficient